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Symposium on nutrient losses from soil by leaching and drainage
Journal of The Science of Food and Agriculture
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The chemical composition of displaced soil solutions is used to illustrate the procedure for correcting measured ionic concentrations to actual ionic concentrations and ionic activities. The procedure distributes soil‐solution electrolytes at equilibrium among their various ionic species by using equations for ion‐activity coefficients, ion‐pair dissociation, weak‐acid and weak‐base dissociation, and hydrolysis. More than a score of related equations had to be solved simultaneously; thus, mathematical solution was effected through the method of successive approximation. Rapid correction of soil‐solution analytical data to actual concentrations and activities of individual soil‐solution ions was made possible by using computer program.
Usually the sum of the CO2 and oxygen is only slightly less than in atmospheric air but at periods when nitrates rapidly increase there is a perceptible falling off of oxygen, and a still greater one in waterlogged soils.(Received November 20 1914)
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